Band gap engineered TiO2nanoparticles for visible light induced photoelectrochemical and photocatalytic studies

These results clearly show that the visible light photocatalytic activity of Modi ed TiO2 nanoparticles can be improved greatly by narrowing the band gap and forming various defects and Ti3+ centers.15,23,44,45

Mohammad Mansoob Khan; Sajid A. Ansari; D. Pradhan; M. Omaish Ansari; Do Hung Han; Jintae Lee; Moo Hwan Cho

2013

Scholarcy highlights

  • Nanocrystalline transition metal oxides have attracted considerable attention because of their potential applications in a range of processes, and are expected to be the key materials for further developments of science and technology. Among the metal oxides available, TiO2 has attracted particular attention owing to its exceptional properties, such as low cost, high stability, high chemical inertness, biocompatibility, non-toxicity, etc. TiO2 has been examined widely as an efficient photocatalyst for puri cation of water, and degradation of dyes, pesticides, etc. since the discovery of its photocatalytic properties by Honda–Fujishima. On the other hand, TiO2 is virtually inactive in visible light owing to its wide band gap
  • In the modi cation process, electron beam is used as a “defect engineer”, which can create a range of defects or modi cation in the TiO2 nanoparticles, thereby imparting novel characteristics, such as reduced band gap and visible light induced photocatalytic activities
  • The variation in the photocatalytic activity of p-TiO2 and Modi ed TiO2 nanoparticles is supported by diffuse reflectance spectroscopy), electron paramagnetic resonance, and X-ray photoelectron spectroscopy. These results clearly show that the visible light photocatalytic activity of m-TiO2 nanoparticles can be improved greatly by narrowing the band gap and forming various defects and Ti3+ centers
  • An electron beam was used to modify TiO2 nanoparticles under ambient conditions, which results in an improvement in their visible light-induced photocatalytic activities
  • Visible light induced photocatalytic degradation of methylene blue and brilliant blue G further con rmed the improved photoactivity of the m-TiO2
  • This study suggests that m-TiO2 can be used as a visible light active photocatalyst and photoelectrode material
  • The electron beam treatment can be used to prepare photoactive materials with enhanced visible light-induced photoactivity

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